Clean Harbors Grassy Mountain
Verified Oct 19, 2026 against U.S. EPA RCRAInfo
Clean Harbors Grassy Mountain (EPA ID UTD991301748) is a permitted hazardous-waste treatment, storage and disposal facility in Knolls, Utah, operated by Clean Harbors Environmental. Operating permitted units: landfill, surface impoundment, treatment, storage. In the 2023 Biennial Report it received 46,641 tons of hazardous waste from off-site. EPA waste-code classes received: Toxic metals (D004–D011), Electroplating and metal-finishing wastes (F006–F019), Spent solvents (F001–F005), Wood-preserving wastes and leachate (F032–F039). Received waste was managed mainly by landfill. Last on-site inspection: September 14, 2026. In the last five years: 11 inspections, 21 violations, 0 formal enforcement actions and $0 in final penalties. Most cited areas: Permit Condition or Requirement; TSD - Container Use and Management; Federal or State Statute; Used Oil - Generators. It is not currently flagged as a significant noncomplier.
Key facts
| Facility type | Waste management firm source |
|---|---|
| Off-site receipts (latest Biennial Report) | 10,000–100,000 tons source |
| Violation record (5 years) | 21+ violations source |
| How received waste was managed | Landfill source |
| Waste received, by EPA code class | Toxic metals (D004–D011), Electroplating and metal-finishing wastes (F006–F019), Spent solvents (F001–F005), Wood-preserving wastes and leachate (F032–F039) source |
| Permitted operating units | Landfill, Surface impoundment, Treatment, Storage source |
| Final penalties, last 5 years | 0 USD source |
| Formal enforcement actions, last 5 years | 0 source |
| Last on-site inspection | Sep 14, 2026 source |
| Significant noncomplier now | No source |
| EPA ID | UTD991301748 source |
| Operator | Clean Harbors Environmental source |
| Owner type | Private source |
| Off-site receipt flag (RCRAInfo notification) | Yes source |
| Commercial TSDF | Yes source |
| Waste received from off-site | 46,641.3 tons source |
| Biennial Report cycle | 2023 source |
| Inspections, last 5 years | 11 source |
| Violations, last 5 years | 21 source |
| Violations not yet returned to compliance | 3 source |
| Violation areas (5 years) | Permit Condition or Requirement, TSD - Container Use and Management, Federal or State Statute, Used Oil - Generators source |
| Universal waste destination facility | No source |
| Used oil activities | Yes source |
| Transfer facility | Yes source |
| Recycler | No source |
| Primary NAICS | 562211 source |
Similar hazardous waste facilities
- Clean Harbors Lone Mountain LLC
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Browse related lists
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